Download QNET DCMCT DC Motor Control Trainer (DCMCT) User Manual

Quanser NI-ELVIS Trainer (QNET) Series:
QNET DCMCT
DC Motor Control Trainer (DCMCT)
User Manual
User Manual
QNET-DCMCT User Manual
Table of Contents
1. Introduction..........................................................................................................................1
2. Requirements.......................................................................................................................1
3. References............................................................................................................................1
4. DCMCT Plant Presentation.................................................................................................1
4.1. Component Nomenclature...........................................................................................1
4.2. DCMCT Plant Description..........................................................................................2
5. DC Motor Control Trainer Setup.........................................................................................3
5.1. ELVIS and DCMCT Module Setup Procedure............................................................3
5.2. DCMCT LabView Controllers.....................................................................................5
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1. Introduction
The Quanser National Instruments Engineering Trainer (QNET) is a versatile and powerful
training tool. Amongst its many capabilities, the QNET series of trainers allows for PC
based control using the LABVIEW programming language, a National Instruments E-Series
or M-Series data acquisition card, and an ELVIS workstation. The QNET allows for a
scalable laboratory setup utilizing the ELVIS workstation platform.
The DC Motor Control Trainer (DCMCT) QNET module is designed to operate on the NIELVIS platform. The ELVIS unit is connected to an NI E-Series or M-Series data
acquisition card inside the PC. The Labview program interacts with the data acquisition
card to read three inputs – encoder, tachometer, and current sensor – and control the output
voltage to the motor.
2. Requirements
The following system is required to complete the DC Motor Control Trainer laboratory:
 PC equipped with an NI-E Series or NI-M-Series data acquisition card connected
to an NI ELVIS station.
 Quanser QNET-010 DC Motor Control Trainer (DCMCT) module.
 ELVIS CD installed for required drivers
 LabView 7.1 with the following add-ons installed:
 Control Design Toolkit
 Simulation Module
3. References
[1] NI-ELVIS User Manual
[2] QNET LabView Controllers
[3] QNET Experiment #01: DC Motor Speed Control
[4] QNET Experiment #02: DC Motor Position Control
4. DCMCT Plant Presentation
4.1. Component Nomenclature
As a quick nomenclature, Table 1, below, provides a list of the principal elements
composing the DC Motor Control Trainer (DCMCT) system. Every element is located and
identified, through a unique identification (ID) number, on the DCMCT plant represented in
Figure 1.
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ID #
Description
ID #
Description
1
DC Motor
3
DC Motor Case
2
Motor Encoder
4
Disc Load
Table 1 DCMCT Component Nomenclature
Figure 1 DCMCT Components
4.2. DCMCT Plant Description
The DCMCT system consists of a DC motor equipped with a servo motor driving a
disc load. The on-board amplifier that drives the motor on the module is powered by
an independent ±24V DC power supply. The motor input is a voltage with a range
of ±24V. The motor has an encoder that measures its position, a digital tachometer
that measures its speed, and a current sensor to measure the actual current being fed
into the motor.
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5. DC Motor Control Trainer Setup
Section 5.1 explains how to setup the DCMCT module on the ELVIS unit and properly initialize the system. The LabView controllers associated with the DCMCT QNET module are
overviewed in Section 5.2.
5.1. ELVIS and DCMCT Module Setup Procedure
The QNET modules are designed to quickly and easily plug into the ELVIS prototype
board slot and be ready for operation. Please configure the DCMCT system for use with the
LabView virtual instruments by following the steps below.
Step 1.Do NOT make the following connections while power is supplied to the
hardware, even when the Standby Switch on the rear panel of the NI ELVIS
Benchtop Workstation is switched to OFF.
Step 2.Install the QNET DCMCT board by completing the following steps:
a) Position the large opening in the QNET board, over the mounting
bracket on the NI ELVIS benchtop workstation. Note that some ELVIS
workstations do not have the mounting brackets.
b) Slide the PCI connector of the QNET module end into the female
connector of the NI ELVIS workstation, as shown in Figure 2.
c) Gently rock the board to ease it into place. It may be a tight fit, but do
not force the board into place. The QNET board should now slide into the
board bracket.
Figure 2 Fasten QNET Module onto ELVIS
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Step 3.Connect the AC-DC wall transformer supplied with the ELVIS system to the
corresponding input on the back panel of the NI ELVIS Benchtop Workstation.
Step 4.Connect the power cord to the AC-DC transformer and plug the power cord into
the wall outlet.
Step 5.Similarly to power the QNET module, connect the AC-DC wall transformer that
was provided with the QNET module to its bulk power jack, as shown in Figure 3.
Figure 3 Module Power
Step 6.Connect the power cord to the QNET wall transformer and plug the power cord
into the wall outlet.
Step 7.Before powering up the system, ensure the Prototyping Board Power switch is set
to the OFF position and the Communications switch is set to the BYPASS mode.
Step 8.Power the NI ELVIS Benchtop Workstation by turning the Standby Switch on the
rear panel of the system to ON.
Step 9.The System Power and Communications LEDs situated on the front panel of the
NI ELVIS unit, as shown in Figure 4, should be lit. As depicted in Figure 3, verify
also that the +15V,-15V, and +5V LEDs on the QNET module are lit. They
indicate that the board has been properly connected to the ELVIS unit.
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Figure 4 ELVIS Front Panel Power Switch
Step 10.Turn ON the Prototyping Board Power switch on the front panel of the NI
ELVIS workstation. The Prototyping Board LED on the ELVIS front panel should
turn bright green, see Figure 4, and the bulk power LED labeled as +B on the
QNET module board should be bright green as well, as shown in Figure 3. The onboard amplifier that drives the motor is now powered.
Turn OFF the Prototyping Board switch if the DC motor begins to turn! Any
voltage applied by analog output channels #0 and #1 is amplified and delivered to
the motor. Take extra care when powering the QNET module to avoid causing any
damage to the motor.
Step 11.The hardware setup is complete and you are now ready to load a given LabView
virtual instrument and interact with the QNET module.
5.2. DCMCT LabView Controllers
There are two Quanser LabView Virtual Instruments supplied with the QNET-DCMCT
module:
 QNET_DCMCT_Lab_01_Speed_Control.vi
 QNET_DCMCT_Lab_02_Position_Control.vi
The first Quanser LabView simulates and implements DC motor speed control and its
associated laboratory manual is QNET Experiment #01: DC Motor Speed Control. The
second Quanser LabView VI simulates and implements a position controller for the DC
motor and its corresponding laboratory manual is QNET Experiment #02: DC Motor
Position Control. See QNET LabView Controllers guide for a general explanation on the
challenges involved in the DC motor speed and position control laboratories.
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